University of Twente Student Theses


Ripening silt to clay : a design for the Eems-Dollard testing ground

Broek, J.F. van den (2017) Ripening silt to clay : a design for the Eems-Dollard testing ground.

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Abstract:High amounts of suspended silt present in the Eems-Dollard estuary damage the ecology of the estuary by blocking sunlight and elevate the harbour fairways. With multiple nature areas nearby this could have a detrimental effect on the biodiversity in the Netherlands. While there is currently a high demand in the area for clay, silt has barely any function. In order to convert the one in the other, and in a sustainable way, a clay ripening facility was devised. In this study a first design based on currently available data will be created. The study strives to make a clear basis for future projects. First, a basis of design was made numbering all requirements and assumptions in the design. Second, the dikes were checked for potential macro-instability by using a safety factor of 1.35, which was met. Lastly, the drainage of the testing ground was calculated for a horizontal sand layer and drainage pipes. The standard values of dredged silt were used for the hydraulic conductivity, 5 m/d at the start and 0.001 m/d at the end. Using these values the drainage can be completed in 300 days. However, when using other possible values of the hydraulic conductivity of the silt, the ripening does not finish within the maximum of three years. Therefore, the outcome is unknown until these values have been determined via empirical research. This study shows results that are generalizable and is a useful step in order to make clay ripening a realistic method. However, more knowledge with regard to the ripening process is needed in order to prove that clay ripening is profitable.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
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